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Bloop! Unlike the rest of Us, when stars make mistakes, they're typically immortalized from the red carpet to the stage. Us Weekly's master cut video of the biggest celebrity bloopers ever includes Justin Timberlake and Janet Jackson's nipple baring moment during the 2004 Super Bowl Halftime Show, John Travolta's memorable "Adele Dazeem" flub while introducing Idina Menzel at the 2014 Oscars, and Tara Reid baring her boob on the red carpet prior to hitting up Sean "Diddy" Combs' 35th birthday bash back in 2004.

Joining the foray of flubbers includes stars who've struggled to maintain their balance, including Iggy Azalea, Lady Gaga, and two-time Academy Awards offender Jennifer Lawrence. The biggest celeb bloopers reel also includes singers' poor attempts at live singing, including, cough, Ashlee Simpson. In October 2004, the "Pieces of Me" singer infamously attempted to lip sync during a Saturday Night Live performance, which totally backfired.

On the opposite end, one leading actress and Oscar winner, Julia Roberts, had some rather harsh words for her interviewer, Billy Bush, one year during an NBC red carpet interview. "God, NBC, you guys are in the gutter right now!" she joked during a Golden Globes appearance back in 2010.

What would a master cut reel be, however, without celebrities forgetting and completely nixing their speech? These culprits include Justin Bieber forgetting Ariana Grande's lyrics during a joint performance, Jacqueline Bisset rambling during her 2014 Golden Globes speech ("Okay, Scottish background to the front!"), and Kendall Jennerembarrassingly garbling her thoughts at the 2014 Billboard Music Awards ("Guys, I'm the worst reader!").